Question

what year is considered a great demographic divide India

Answer 1

In the decade of 1921-1931, the increase was 11.1%, from 1931 to 1941, it was 14.00% and during 1941-1951, it was 13.5%. It is going increasingly since then. Hence the year 1921 is rightly called the demographic divide

Answer 2

The year 1921 is taken as the demographic divide for the reason that before this year, the population was not stable, sometimes it increased and at other times it decreased.